What does hairpin wiring accomplish in floral design?

Hairpin wiring is a technique used in floral design primarily to attach leaves, stems, or other elements to an arrangement effectively. When leaves are wired using this method, they can be secured in place in such a way that their natural shape and form are maintained, allowing for a more cohesive and aesthetically pleasing design. This technique helps position the leaves at the desired angle, enhancing the overall look of the floral arrangement.

The other aspects mentioned in the choices relate to different techniques or tools used in floral design, but they do not accurately describe the primary function of hairpin wiring. For instance, securing flowers with a straight pin or locking stems in a water reservoir involves different methods altogether. Flexibility in design changes doesn't directly pertain to the specific function of hairpin wiring either. Hence, option B best aligns with the purpose and application of hairpin wiring in the context of floral arrangements.